Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd09e144a3398330…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 06:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a23a4f2fde17ffd72269afb4c991f3e6 SHA-1: 722e3f4d9882837071927381861cd93da882a507 SHA-256: fd09e144a3398330dd95eff811a9845d3f23f0ddb8c32b3555a7c76a6331b786
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites or disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user clicks, likely for phishing or to distribute further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using link farms on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=dragon+ball+strongest+war+android PDF link annotation
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/sesuluwuroboxobarikode.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/gomefotujalebilo.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/888027789.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/zejadamijoda.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nokuketese.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210916154812_lnkmxh.pdfIn PDF document text
    • http://bresky.cz/res/file/foxefitekokem.pdfIn PDF document text
    • http://dytac.hk/userfiles/towotufazalunesadibiz.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/98170250939.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/beb5750fb792e492c9232ed8f5f61761/gikajojibinawap.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/tutibujoxuwegiwejesa.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613926201f3ab---kikuped.pdfIn PDF document text
    • http://kisito.com/userfiles/file/44487606195.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141b1220970b---kalateruzigewuzig.pdfIn PDF document text
    • http://a2designbg.com/userfiles/file/larujusi.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/55771677274.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/jajinulunedasof.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/lovinaxeni.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/pefoliraxupifetinirufebok.pdfIn PDF document text
    • http://villkasz.hu/editor_up/60404543064.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/51436391469.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/65520499679.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/lefososimosaduxukupizomob.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4deed19e6---15881532445.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6h2l5gl0nmtggks1t2reucppr5/75695390834.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA49 18020 bytes
SHA-256: e5d97000f17d83ca132a82bab7e9665d64680442b9f50b533720a81cf8bc6a56
font_01_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 10652 bytes
SHA-256: 83e5999380d0185b458e6148c70447e63b0061edfeb61d2a359a53ac5662fdb6
font_02_sfnt_off000110d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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